Manufacture of compound plates



(No Model.)

R. P. MANLY 8u P. H. TAYLOR.

MANUPAGTURE 0F GOMPOUND PLATES.

No. 355,274. Patentd Deo. Z8, 1886.

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UNITED STATES PATENT OFFICE..

ROBERT P. MANLY, OF RADNOE, AND FRANK H. TAYLOR, OF PHILADEL- PHIA, PENNSYLVANIA, ASSIGNOR TO THE MANLY COOPER MANUFAC- TUBING COMPANY, OF PENNSYLVANIA.

MANUFACTURE OFCOMPOUND PLATES.

SPECIFCATION forming pari: of Letters Patent No. 355,274-, dated December 28, 1886.

Application tiled October 2Q, 1886. Serial No. 217,064.

To @ZZ 1071.0712 t may concern.-

Be it known that we, ROBERT l?. MANLY and FRANK H. TAYLOR,- citizens of the United States, the said ROBERT P. MANLY residing 5 in Radnor, Delaware county, Pennsylvania, and the said FRANK H. TAYLOR residing in Philadelphia, Pennsylvania, have invented certain Improvements in the IlIanufacture of Compound Plates or Bars for Jails and Safes,

lo of which the following` is a specification.

The object of our invention is to manufacture compound bars or plates for jail and safe construction more economically t-han such bars have heretofore been produced.

In making compound bars or plates of iron and steel for use in the construction of jails and safes it has been customary to weld the bars or plates of iron and steel together by rolling or otherwise; but this method is very zo expensive and not always effective for the pur pose, and, moreover, the rivet-holes necessary for uniting the bars and plates together in making the structure have to be punched through the completed compound bars or plates after welding, and this operation is a very diliicult one and is destructive of the punching-machine- To produce these compound plates more economically', we dispense entirely with the 3o welding process, and we punch the rivet-holes in the separate leaves of iron and steel (which are to form the compound plate) before unit ing them. IVe then unite the leaves of iron and steel to form the compound bar or plate by riveting, then heat the bar to a hardeningheat, and subject it to a hardening-bath to give the proper hardness to the layer or leaves of steel in the bar; and we also prefer to run the riveted bar through straightening-rolls, either 4o before or after subjecting them to hardening,

as more fully described hereinafter.

In the accompanying drawings, Figure l is a perspective view showing'4 three leaves of iron and steel after they have been punched,

but before they are united. Fig. 2 is a perspective view ofthe same after the leaves have been united by riveting to form the compound bar. Fig. 3 is a transverse section of another form of compound bar, in which iive leaves are 5o used instead. of three. Fig. 4 is a view, drawn (No mo,1 cti to a reduced scale, illustrating the manner of making lattice-work for jail or safe construetion from these compound bars. Fig. 5 is a perspective view ofa portion of a compound plate riveted up in accordance with our invention. Fig. 6 is a plan view drawn to an enlarged scale. Fig. 7 is a section on the line l 2, Fig. 65and Fig. 8 is a section on the line 3 4, Fig. 6.

ln making compound bars or plates in accordance with our invention, we prefer to use three or five leaves for each plate or bar, although these numbers are not essential. In making the compound bar or plate of three leaves,the two outer leaves are of iron and the center one of steel, and in making a veleaved compound bar we use iron for the central and the two outside leaves and steel for the intermediate second and fourth leaves.

In making the compound bar, we take the separate leaves A and B, of the desired width7 70 and punch holes a in them at suitable intervals, preferably by a gang-punch. The bars are then laid on each other in the desired way, and rivets b are passed through every second set of holes, and the bars are united by means 7 5 of these rivets, preferably by drop-riveting, although a pneumatic, hydraulic, or any other riveting-machine may be used.

The reason for using only every other set of rivet-holes in the bar to unite the leaves is to 8o 'D to these riveted bars for convenience in construction, as will be understood on reference to Fig. 4.

In the transverse section, Fig. 3, we have illustrated a compound bar made of iive leaves, the cent al and outside leaves, A A, being of iron, while the two intermediate leaves, B B, are of steel. In this compound bar also, as in the three-leaved bar, the rivet-holes (not only for go uniting the separate leaves together, but also for uniting the bars in the iinal structure) are punched in the separate leaves before they are united.

The punching operation is thus rendered comparatively easy, and can be done on a comparatively light class of machinery.

The compound bar or plate, consisting of the riveted leaves, as above described, is then put in a heating-furnace and brought to a Ioo rIo bright-red or hardening heat, and it is then subjected to a hardening-bath to harden the steel, and We prefer, also, in order to obtain a uniform product, to pass the har through straightening-rolls. In practice, we prefer to run the bar through the straightening-rolls as soon as it comes out of the furnace, and then to `drop it into the hardening-bath; but the order of these operations is not material. In order to insure such a uniting of theleaves f of each compound bar as to prevent their separation by some evil-disposed person cutting off the heads of the rivets in the finished structure,we so form or arrange the rivet-holes in the several leaves that the corresponding rivetholes in the several plates are slightly out -of coincidence. This Want of coincidence may be obtained by making the corresponding holes ofslightly-diiierentshapes or slightly-different sizes, or in slightly-different positions. IVe prefer, however, to make the holes oval, as illustrated in Fig. 6, and to arrange those in the two outer plates so far out of coincidence with the holes in the central plate or plates as to be practically at right angles, as shown in Fig, so that when the rivet is forced through, in a hot or cold state, into the holes,and hammered so as to ll them up, it not only unites the plates together,as the common rivet would, but it so unites them that, even if the top or head of the rivet were to be cut away,it would still hold the plates together, as Will be understood on reference to Figs. 5, 7, and 8.

We claim as our invention- 1. rlhe mode herein described of making compound bars or plates of iron and steel for jail and safe construction, said mode consisting in first punching the rivet-holes in the separate leaves, riveting the leaves together, and then hardening the compound bar o1' plate thus formed, substantially as set forth.

2. The mode herein described of making compound bars or plates of iron and steel for jail and safe construction, said mode consisting in first punching the holes in the separate leaves, riveting t-he leaves together through every other set of holes, and-then hardening and straightening the compound bar or plate thus formed.

3. The mode herein described of making compound bars or plates of iron and steel for jail and safe construction, said mode consisting in rst punching the separate leaves, riveting the punched leaves, heating the,` coinpound bar or plate,and subjectingit to a hardching-bath and passing it through strightening-rolls, all substantially as specified.

4. The mode herein described of making compound bars or plates for jail and safe construction, said mode consisting in punching the separate leaves which forni the bar or plate With corresponding holes slightly out of coincidence, and then riveting the said leaves together through said holes, substantially as specified.

In testimony whereof we have signed our names to this specification in the presence lof two subscribing witnesses.

ROBT. P. MANLY. FRANK H. TAYLOR.

Witnesses:

ALBERT PoPKINs, `HARRY SMITH. 

